JP2012036386A - Heat radiation member for motor cooling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat radiation member for motor cooling which achieves excellent thermal conductivity and vibration resistance, high-speed stress tolerance and lightweight properties, highly efficiently radiates heat in response to motor output increase, and can ensure vibration resistance, rigidity in rotor magnetization and weight reduction.SOLUTION: The heat radiation member for motor cooling is obtained by molding a resin composition which is prepared by blending, when the total of (A), (B) and (C) is considered to be 100 wt.%, (A) 25-45 wt.% of a polyphenylene sulfide resin, (B) 10-60 wt.% of magnesium hydroxide and (C) 15-65 wt.% of a glass fiber having a fiber diameter of 4-11 μm, and which has thermal conductivity of ≥0.8 W/m K as measured by a heat flowmeter method.

Description

  The present invention relates to a heat-radiating member for cooling a motor that is excellent in vibration resistance, high-speed stress resistance, thermal conductivity, and light weight.

  In recent years, various efforts have been made with regard to global warming and energy problems from the viewpoint of low environmental load. In particular, motors that reduce the emission of carbon dioxide and nitrogen oxides during driving, such as fuel cell vehicles, electric vehicles, and hybrid vehicles that use gasoline engines and motors, which use electric motors as drive mechanisms, are candidates for next-generation vehicles. High performance is being promoted.

  When using a motor for the drive mechanism, a motor is installed on the chassis of the car in the same way as a conventional gasoline internal combustion engine, and in addition to transmitting the driving force to the tire via the power transmission mechanism, the motor is installed in the tire wheel. In-wheel motor systems that transmit power by incorporating them have been developed. The in-wheel motor system is attracting attention as a technology that can provide a vehicle interior space that is equal to or better than that of a gasoline internal combustion engine (engine) vehicle and that can improve the running stability of the vehicle by independently driving each tire wheel. Development is proceeding mainly.

  On the other hand, in order to use a motor for the drive mechanism, it is necessary to improve the output of the motor, and to use it as an in-wheel motor, it is necessary to reduce the size and the safety of parts against the impact received from the road surface during traveling.

  In order to improve the motor output, a concentrated winding type motor in which a winding is directly wound around a portion where a motor stator (stator) magnetic pole portion is subjected to insulation treatment is often used. At that time, in the process of magnetizing the rotor (stator), conventionally, the magnetizing is performed by a magnetizing jig dedicated to magnetizing an external magnetizing yoke. However, when it is assembled into a case or the like, dust or dirt adheres to the rotor, or when it is assembled into the stator due to the magnetic force of the rotor, it may hit the stator and break, making handling very difficult. Therefore, in recent years, a built-in magnetizing method has been performed in which the stator winding is used as a magnetized winding, and the rotor is built into the stator in advance and the permanent magnet in the rotor is magnetized (high voltage is applied to the stator winding several times). It has become like this. However, when a high voltage is applied at the time of magnetization, a force for attracting the rotor works due to the strong magnetizing magnetic field of the stator magnetized winding. As a result, since the rotor is fixed to the case, on the contrary, a stress that strongly attracts the winding of the stator to the rotor acts. As a result, the member that insulates and protects the winding and the member connected thereto are subjected to high-speed stress in a certain direction instantaneously when a high voltage is applied. There are many problems that the stator member is damaged by this strong stress. As a result, there is a problem that the insulation of the motor is impaired and burnt out, or the life of the motor is reduced.

  As the motor output increases, the amount of heat generated by copper loss and iron loss during motor operation increases, and the generated heat reduces the life of the motor.

  When mounted on a wheel as an in-wheel motor, depending on the mounting method, it is mounted below the suspension of the vehicle body, that is, directly on the tire. Therefore, it must be downsized so that it can be stored in the foil. Improvement in vibration resistance of motors and peripheral parts by receiving road surface vibration by being directly mounted on a tire is desired.

  In addition, it is said that weight reduction is the most effective for extending the cruising distance of a car, and weight reduction of motors and peripheral parts is important in consideration of environmental performance.

  In response to the above-described problems, a new motor cooling heat dissipation member excellent in vibration resistance, high-speed stress resistance, thermal conductivity, and light weight is required.

  By the way, a polyarylene sulfide resin (hereinafter may be abbreviated as PPS resin), a polyarylene ether-based resin, a resin composition containing a reinforcing material and magnesium hydroxide is molded, and a surface to be a reflective surface of the molded product is formed. A lamp reflector (see, for example, Patent Document 1) characterized by providing a metal film is known.

  Moreover, as a resin composition used for electric / electronic parts and automobile parts, Patent Document 2 is excellent in electric characteristics such as arc resistance containing a polyarylene sulfide resin and a metal oxide mainly composed of magnesium hydroxide. Patent Document 3 discloses a resin composition with improved tracking resistance obtained by blending a polyarylene sulfide resin, magnesium hydroxide, a fibrous filler and / or a non-fibrous filler. Document 4 discloses a resin composition excellent in molding surface appearance and arc resistance including polyarylene sulfide resin containing glass fiber, talc and magnesium hydroxide. Patent Document 7 discloses polyphenylene sulfide resin containing magnesium hydroxide and carbonate. Polyphenylene sulfide resin compositions having excellent machinability made of calcium are described respectively. It has been.

  In addition, as a polyphenylene sulfide resin composition that can be used for electrical equipment parts and the like, Patent Document 5 discloses that a polyphenylene sulfide resin is selected from a polyolefin polymer and / or a polyolefin copolymer, silicone, and a fluorine resin. A polyphenylene sulfide resin composition having excellent tracking resistance comprising a seed or two or more, magnesium hydroxide, and a fibrous and / or non-fibrous filler is disclosed.

  Further, Patent Document 6 discloses a polyphenylene sulfide resin composition that can be used for a light socket or the like, and Patent Document 5 discloses a magnesium hydroxide and fiber-like and / or non-surface-treated polyphenylene sulfide resin. A polyphenylene sulfide resin composition having excellent tracking resistance comprising a fibrous filler is disclosed.

  However, in any of these documents, the polyphenylene sulfide resin composition is excellent in vibration resistance, high-speed stress resistance, thermal conductivity, and light weight, and is suitable as a heat-dissipating member for motor cooling that requires heat dissipation. Is not disclosed.

JP-A-5-320506 (Claims and Examples) Japanese Laid-Open Patent Publication No. 1-318068 (Claims, Examples) JP 2001-288363 A (Claims, Examples) JP-A-2-64158 (Claims, Examples) JP-A-8-291253 (Claims, Examples) JP-A-2002-167510 (Claims, Examples) JP 2008-81580 A (Claims, Examples)

  However, replacing metal as a heat dissipation measure to increase the heat generation due to recent motor output improvement, high-speed stress resistance in the magnetizing process, and to increase the output and vibration in the mounting environment, and to reduce the size and weight of the motor. There is a need for a heat radiating member for cooling a motor that is formed by molding a resin composition that is excellent in vibration resistance and high-speed stress resistance, and has good thermal conductivity and light weight.

  Therefore, this invention solves the above-mentioned subject and makes it a subject to provide the heat dissipation member for motor cooling excellent in vibration resistance, high-speed stress resistance, lightweight property, and heat conductivity.

In order to solve the above problems, the present invention has the following configuration.
1. (A) 25 to 45% by weight of polyphenylene sulfide resin, (B) 10 to 60% by weight of magnesium hydroxide, and (C) fiber diameter is 4 to 100% by total of (A), (B) and (C) A heat-dissipating member for cooling a motor formed by blending 15 to 65% by weight of 11 μm glass fiber and molding a resin composition having a thermal conductivity of 0.8 W / m · K or more measured by a heat flow meter method.
2. 2. The motor cooling heat dissipation member according to 1, wherein the glass fiber has a fiber diameter of 5 to 8 [mu] m.
3. The resin composition is a resin composition obtained by further blending 1 to 10 parts by weight of (D) an olefin resin with respect to a total of 100 parts by weight of (A), (B), and (C). The heat radiating member for motor cooling according to any one of?
4). The motor cooling according to any one of 1 to 3, wherein the resin composition is a resin composition obtained by further blending 1 to 45 parts by weight of (E) talc and / or mica with respect to 100 parts by weight of (B). Heat dissipation member.
5. The motor cooling heat dissipating member according to any one of 1 to 4 used for a motor stator peripheral member.
6). The motor cooling heat dissipating member according to any one of 1 to 5 mounted on an in-wheel motor.

  The motor cooling heat dissipating member of the present invention is excellent in vibration resistance, high speed stress resistance, light weight, and thermal conductivity. According to the heat radiating member for cooling the motor of the present invention, it can be continuously processed into a desired shape using an injection molding machine or the like, and has excellent vibration resistance, high speed stress resistance, light weight, heat conduction. It is possible to obtain a motor cooling heat dissipating member having the property.

  The motor cooling heat dissipating member of the present invention needs to dissipate heat generated from the motor and motor periphery to the outside and dissipate heat, such as a heat dissipating case and fins, a refrigerant circulation case and cap, and the like. It is useful for a member that can endure vibration during motor driving and a stator member that performs a rotor permanent magnet magnetization process in a state where the stator is incorporated.

  Hereinafter, the present invention will be described in detail.

  Typical examples of the (A) PPS resin used in the present invention include polyarylene sulfide, polyarylene sulfide sulfone, polyarylene sulfide ketone, random copolymers thereof, block copolymers, and mixtures thereof. Polyarylene sulfide is particularly preferably used. Such polyarylene sulfide is a polymer preferably containing 70 mol% or more, more preferably 90 mol% or more of a repeating unit represented by the following structural formula. When the repeating unit is 70 mol% or more, Is preferable in that it is excellent.

  In addition, such polyarylene sulfide resin can be composed of 30 mol% or less of the repeating unit with a repeating unit having the following structural formula, and may be a random copolymer or a block copolymer. It may be a mixture thereof.

  Such polyarylene sulfide resins are generally known in the art, that is, a method for obtaining a polymer having a relatively small molecular weight described in JP-B-45-3368, or JP-B-52-12240 and JP-A-61-7332. It can be produced by a method for obtaining a polymer having a relatively large molecular weight described in the publication.

  In the present invention, the polyarylene sulfide resin obtained as described above is subjected to crosslinking / polymerization by heating in air, heat treatment under an inert gas atmosphere such as nitrogen or under reduced pressure, an organic solvent, hot water, Of course, it is possible to use it after various treatments such as washing with an acid aqueous solution, activation with a functional group-containing compound such as an acid anhydride, amine, isocyanate, or a functional group-containing disulfide compound.

  Specific methods for crosslinking / high molecular weight polyarylene sulfide resin by heating include an atmosphere of an oxidizing gas such as air or oxygen, or a mixed gas atmosphere of the oxidizing gas and an inert gas such as nitrogen or argon. Below, a method of heating until a desired melt viscosity is obtained at a predetermined temperature in a heating container can be exemplified. In this case, the heat treatment temperature is preferably 150 to 280 ° C., more preferably 200 to 270 ° C., and the treatment time is preferably 0.5 to 100 hours, more preferably 2 A range of ˜50 hours is selected, but by controlling both, a target viscosity level can be obtained. Such a heat treatment apparatus may be a normal hot air drier or a heating apparatus with a rotary or stirring blade. However, in the case of efficient and more uniform treatment, heating with a rotary or stirring blade is possible. More preferably, an apparatus is used.

As a specific method for heat-treating the polyarylene sulfide resin under an inert gas atmosphere such as nitrogen or under reduced pressure, an inert gas atmosphere such as nitrogen or under reduced pressure (preferably 7,000 Nm ^-2 or less), Examples of the heat treatment method include a heat treatment temperature of 150 to 280 ° C, preferably 200 to 270 ° C, and a heating time of 0.5 to 100 hours, preferably 2 to 50 hours. Such a heat treatment apparatus may be a normal hot air drier or a heating apparatus with a rotary or stirring blade. However, in the case of efficient and more uniform treatment, heating with a rotary or stirring blade is possible. More preferably, an apparatus is used.

  When the polyarylene sulfide resin is washed with an organic solvent, the organic solvent used for washing is not particularly limited as long as it does not have an action of decomposing the polyarylene sulfide resin. For example, nitrogen-containing polar solvents such as N-methylpyrrolidone, dimethylformamide, dimethylacetamide, sulfoxide sulfone solvents such as dimethyl sulfoxide, dimethylsulfone, ketone solvents such as acetone, methyl ethyl ketone, diethyl ketone, acetophenone, dimethyl ether, dipropyl ether , Ether solvents such as tetrahydrofuran, halogen solvents such as chloroform, methylene chloride, trichloroethylene, ethylene chloride, dichloroethane, tetrachloroethane, chlorobenzene, methanol, ethanol, propanol, butanol, pentanol, ethylene glycol, propylene glycol, phenol, Alcohol / phenolic solvents such as cresol and polyethylene glycol, benzene and toluene Ene, and aromatic hydrocarbon solvents such as xylene may be used. Of these organic solvents, N-methylpyrrolidone, acetone, dimethylformamide, chloroform and the like are particularly preferably used. These organic solvents are used alone or in combination of two or more.

  As a specific method of washing with such an organic solvent, there is a method of immersing a polyarylene sulfide resin in an organic solvent, and it is possible to appropriately stir or heat as necessary. There is no restriction | limiting in particular about the washing | cleaning temperature at the time of wash | cleaning polyarylene sulfide resin with an organic solvent, Arbitrary temperature of about normal temperature-about 300 degreeC can be selected. Although the cleaning efficiency tends to increase as the cleaning temperature increases, a sufficient effect is usually obtained at a cleaning temperature of room temperature to 150 ° C. The polyarylene sulfide resin that has been washed with an organic solvent is preferably washed several times with water or warm water in order to remove the remaining organic solvent. The water washing temperature is preferably 50 to 90 ° C, and preferably 60 to 80 ° C.

  The following method can be illustrated as a specific method when the polyarylene sulfide resin is treated with hot water. That is, the water used is preferably distilled water or deionized water in order to exhibit a preferable chemical modification effect of the polyarylene sulfide resin by hot water washing. The operation of the hot water treatment is usually performed by adding a predetermined amount of polyarylene sulfide resin to a predetermined amount of water, and heating and stirring at normal pressure or in a pressure vessel. The ratio of the polyarylene sulfide resin and water is preferably as much as possible, and is preferably used at a bath ratio of 200 g or less of polyarylene sulfide resin with respect to 1 liter of water.

  The following method can be illustrated as a specific method in the case of acid-treating a polyarylene sulfide resin. That is, there is a method of immersing a polyarylene sulfide resin in an acid or an aqueous solution of an acid, and stirring or heating can be appropriately performed as necessary. The acid used is not particularly limited as long as it does not have the action of decomposing the polyarylene sulfide resin, such as aliphatic saturated monocarboxylic acids such as formic acid, acetic acid, propionic acid and butyric acid, chloroacetic acid and dichloroacetic acid. Halo-substituted aliphatic saturated carboxylic acids, aliphatic unsaturated monocarboxylic acids such as acrylic acid and crotonic acid, aromatic carboxylic acids such as benzoic acid and salicylic acid, oxalic acid, malonic acid, succinic acid, phthalic acid, fumaric acid, etc. Dicarboxylic acid and inorganic acidic compounds such as sulfuric acid, phosphoric acid, hydrochloric acid, carbonic acid and silicic acid are used. Of these acids, acetic acid and hydrochloric acid are particularly preferably used. The polyarylene sulfide resin subjected to the acid treatment is preferably washed several times with water in order to remove the remaining acid or salt. The water washing temperature is preferably 50 to 90 ° C, and preferably 60 to 80 ° C. The water used for washing is preferably distilled water or deionized water in the sense that the effect of the preferred chemical modification of the polyarylene sulfide resin by acid treatment is not impaired.

  The polyarylene sulfide resin used in the present invention has a melt viscosity of 300 ° C. and a shear rate of 1000/1000 in order to reduce distortion of a molded product at the time of molding and to eliminate composition unevenness (characteristic variation) in the obtained resin composition. It is preferably 80 Pa · s or less, more preferably 50 Pa · s or less, and further preferably 30 Pa · s or less under the condition of seconds. Although there is no restriction | limiting in particular about the minimum of melt viscosity, It is preferable that it is 5 Pa.s or more. Two or more polyarylene sulfide resins having different melt viscosities may be used in combination.

  The melt viscosity of the polyarylene sulfide resin can be measured using a capilograph (manufactured by Toyo Seiki Co., Ltd.) apparatus under conditions of a die length of 10 mm and a die hole diameter of 0.5 to 1.0 mm.

(B) Magnesium hydroxide used in the present invention includes relatively high-purity magnesium hydroxide containing 80% by weight or more of an inorganic substance represented by the chemical formula Mg (OH) ₂ , and includes thermal conductivity, mechanical strength and melt viscosity. In view of the above, preferably the inorganic material represented by Mg (OH) ₂ is 80% by weight or more, CaO content is 5% by weight or less, chlorine content is 1% by weight or less, more preferably Mg (OH) ₂ is 95% by weight or more and CaO content 1 wt% or less, chlorine content 0.5 wt% or less, more preferably Mg (OH) ₂ 98 wt% or more, CaO content 0.1 wt% or less, chlorine content 0.1 wt% or less High purity magnesium hydroxide is suitable.

  The shape of the magnesium hydroxide used in the present invention may be any of particles, flakes, and fibers, but particles and flakes are most preferable from the viewpoint of dispersibility. The particle size is not particularly limited, but the average particle size measured by a laser diffraction method is preferably in the range of 0.1 to 10 μm in view of the balance of mechanical strength and melt viscosity of the resin composition. Those in the range of 0.3 to 4 μm are suitable.

  This (B) magnesium hydroxide is converted into a vinylsilane compound such as vinyltriethoxysilane or vinyltrichlorosilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β- (3,4-epoxy). Epoxysilane compounds such as cyclohexyl) ethyltrimethoxysilane, aminosilanes such as γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane It is preferable to use a surface treatment with a long-chain fatty acid such as a compound, stearic acid, oleic acid, montanic acid, stearyl alcohol or a long-chain aliphatic alcohol, and in particular, (B) water surface-treated with an epoxysilane compound or an aminosilane compound. Application of the magnesium reduction thermal conductivity improving effect, vibration resistance, resistance to high-speed stress resistance, is preferable in terms of light weight.

  (C) Glass fiber having a fiber diameter of 4 to 11 μm used in the present invention includes a glass fiber having a fiber diameter in a range of 4 to 11 μm as observed by a SEM (scanning electron microscope). In view of fluidity, mechanical strength, and high-speed stress resistance, the fiber diameter is preferably in the above range. In particular, fibers having a fiber diameter in the range of 5 to 8 μm are preferable in that the fluidity, mechanical strength and high-speed stress resistance can be balanced at a high level. When the fiber diameter is less than 4 μm, the glass breaks during kneading of the resin composition, the fluidity is remarkably lowered, and the mechanical strength and the high-speed stress resistance are also lowered. When the fiber diameter is larger than 11 μm, the number of glass fibers in the composition is decreased, and it becomes difficult to obtain a reinforcing effect by the glass fibers, resulting in poor mechanical strength and high-speed stress resistance.

  As the form of the glass fiber, any of chopped glass fiber, milled glass fiber, etc. can be used, but chopped glass fiber is preferred from the viewpoint of the fluidity of the resin composition and the mechanical strength of the heat radiating member for cooling the motor. .

  The blending amount of the (A) polyphenylene sulfide resin, (B) magnesium hydroxide, and (C) the glass fiber having a fiber diameter of 4 to 11 μm is set so that the total of (A), (B), and (C) is 100% by weight ( A) 25 to 45% by weight of polyphenylene sulfide resin, (B) 10 to 60% by weight of magnesium hydroxide, and (C) 15 to 65% by weight of glass fiber having a fiber diameter of 4 to 11 μm, more preferably (A) polyphenylene 25 to 40% by weight of sulfide resin, (B) 15 to 60% by weight of magnesium hydroxide and (C) 15 to 60% by weight of glass fiber having a fiber diameter of 4 to 11 μm, more preferably (A) 25 to 35% by weight of polyphenylene sulfide resin And (B) 20 to 60% by weight of magnesium hydroxide and (C) 15 to 55% by weight of glass fiber having a fiber diameter of 4 to 11 μm. That. When the polyphenylene sulfide resin is less than 25% by weight, the fluidity is lowered. On the other hand, if it exceeds 45% by weight, the heat conductivity as a motor cooling heat dissipating member cannot be obtained. If the magnesium hydroxide is less than 10% by weight, the thermal conductivity decreases due to insufficient dispersion of magnesium hydroxide. On the other hand, when the amount is more than 60% by weight, the fluidity is lowered and the load on the apparatus at the time of kneading the resin composition is increased, making it difficult to produce. When the glass fiber having a fiber diameter of 4 to 11 μm is less than 15% by weight, mechanical strength and high-speed stress resistance are lowered. On the other hand, when the amount is more than 65% by weight, the thermal conductivity is insufficient, the fluidity is lowered, and the load on the apparatus at the time of kneading the resin composition is increased, which makes the production difficult.

  The resin composition constituting the heat-radiating member for cooling the motor of the present invention is a thermal conductivity measured by a heat flow meter method by blending a polyphenylene sulfide resin, magnesium hydroxide, and glass fiber having a fiber diameter of 4 to 11 μm as described above. Of 0.8 W / m · K or more can be obtained. Here, the thermal conductivity is a square-shaped product (50 mm × 50 mm × 3 mm thickness, film gate) made of a resin composition, and both surfaces of this molded product are cut to a depth of 0.5 mm to a thickness of 2 mm. Further, it is a value measured by a heat flow meter method thermal conductivity measuring device (GH-1S manufactured by Rigaku Corporation) using a test piece that is further cut and made into a test piece of length × width (20 mm × 20 mm).

  The heat conductivity of the resin composition constituting the motor cooling heat dissipating member of the present invention dissipates heat around the motor that becomes a heat source by contacting the motor and the motor peripheral member, and maximizes the temperature rise of the motor body. In order to suppress the thermal conductivity, it is preferably 0.8 W / m · K or more, more preferably 1.0 W / m · K or more, and further preferably 1.2 W / m · K or more. . If the thermal conductivity is less than 0.8 W / m · K, the heat dissipation effect due to the temperature rise of the motor is lowered, and the motor life is shortened.

  In the present invention, from the viewpoint of further improving mechanical strength and high-speed stress resistance by imparting toughness of the motor cooling heat dissipating member, (D) an olefin resin is further added to the resin composition constituting the motor cooling heat dissipating member. It is preferable to mix 1 to 10 parts by weight with respect to 100 parts by weight of the total of (A), (B) and (C).

  The (D) olefin resin used in the present invention is a polymer obtained by (co) polymerizing olefins, specifically, olefin (co) polymers, and epoxy groups, acid anhydride groups, ionomers, and the like. And an olefinic (co) polymer (modified olefinic (co) polymer) obtained by introducing a monomer component having a functional group (hereinafter abbreviated as a functional group-containing component).

  In the present invention, the olefinic resins may be used alone or in combination of two or more.

  Examples of the olefin polymer include ethylene, propylene, butene-1, pentene-1, 4-methylpentene-1, α-olefin such as isobutylene, or a polymer obtained by polymerizing two or more kinds, α-olefin, Examples include acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, butyl methacrylate and other α, β-unsaturated acids and their copolymers with alkyl esters. .

  Preferred specific examples of the olefin polymer include polyethylene, polypropylene, ethylene / propylene copolymer, ethylene / butene-1 copolymer, ethylene / ethyl acrylate copolymer, ethylene / butyl acrylate copolymer, Examples thereof include ethylene / methyl methacrylate copolymer and ethylene / butyl methacrylate copolymer.

  Examples of functional group-containing components for introducing a monomer component having a functional group such as an epoxy group, an acid anhydride group, or an ionomer into the modified olefinic (co) polymer include maleic anhydride, itaconic anhydride, Citraconic anhydride, endobicyclo- (2,2,1) -5-heptene-2,3-dicarboxylic acid, endobicyclo- (2,2,1) -5-heptene-2,3-dicarboxylic acid anhydride, etc. Monomers containing an acid anhydride group, glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, glycidyl itaconate, glycidyl itaconate, ionomers such as carboxylic acid metal complexes The monomer to contain is mentioned.

  The method for introducing these functional group-containing components is not particularly limited, and a method such as copolymerization or graft introduction to an olefin polymer using a radical initiator can be used. The amount of the functional group-containing component introduced is suitably in the range of 0.001 to 40 mol%, preferably 0.01 to 35 mol%, based on the whole modified olefin polymer.

  Specific examples of the olefin (co) polymer obtained by introducing a monomer component having a functional group such as an epoxy group, an acid anhydride group, or an ionomer into an olefin polymer particularly useful in the present invention include ethylene / propylene- g-glycidyl methacrylate copolymer (“g” represents graft, the same applies hereinafter), ethylene / butene-1-g-glycidyl methacrylate copolymer, ethylene / glycidyl acrylate copolymer, ethylene / glycidyl methacrylate Copolymer, ethylene / methyl acrylate / glycidyl methacrylate copolymer, ethylene / methyl methacrylate / glycidyl methacrylate copolymer, ethylene / propylene-g-maleic anhydride copolymer, ethylene / butene-1-g -Maleic anhydride copolymer, ethylene / methyl acrylate-g-maleic anhydride copolymer , Ethylene / ethyl acrylate-g-maleic anhydride copolymer, ethylene / methyl methacrylate-g-maleic anhydride copolymer, ethylene / ethyl methacrylate-g-maleic anhydride copolymer, ethylene / methacrylic acid Examples thereof include a zinc complex of a copolymer, a magnesium complex of an ethylene / methacrylic acid copolymer, and a sodium complex of an ethylene / methacrylic acid copolymer.

  Preferred are ethylene / glycidyl methacrylate copolymer, ethylene / methyl acrylate / glycidyl methacrylate copolymer, ethylene / methyl methacrylate / glycidyl methacrylate copolymer, ethylene / butene-1-g-maleic anhydride. Examples thereof include an acid copolymer and an ethylene / ethyl acrylate-g-maleic anhydride copolymer.

  Particularly preferred are ethylene / glycidyl methacrylate copolymers, ethylene / methyl acrylate / glycidyl methacrylate copolymers, ethylene / methyl methacrylate / glycidyl methacrylate copolymers, and the like.

  The blending amount of the (D) olefin resin is 1 to 10 parts by weight, preferably 2 to 8 parts by weight, more preferably 100 parts by weight in total of the components (A), (B) and (C). 3 to 6 parts by weight. By blending 1 part by weight or more of the olefin resin, an effect of improving flexibility and impact resistance is obtained, which is preferable, and mechanical strength and high-speed stress resistance are also improved. In addition, by blending 10 parts by weight or less, the thermal stability of the resin composition is not impaired, the thickening during melt kneading when producing the composition can be suppressed, and good injection moldability Can be maintained, which is preferable.

  Specifically, (E) talc and / or mica used in the present invention is hydrated magnesium silicate, and the purity is not particularly limited. The average particle diameter of talc measured by laser diffraction method is preferably in the range of 1 to 50 μm, more preferably 5 to 40 μm, and the range of 10 to 30 μm is further vibration resistance of the heat radiating member for motor cooling. More preferable from the viewpoint of improvement.

  Mica is a kind of layered silicate mineral and is classified into phyllosilicates. It is classified into muscovite, phlogopite and biotite depending on the constituent elements, but muscovite with less impurities such as iron is preferable. The average particle diameter of mica measured by laser diffraction method is preferably in the range of 1 to 50 μm, more preferably 5 to 40 μm, and the range of 10 to 30 μm is further vibration resistance of the heat radiating member for motor cooling. It is preferable from the viewpoint of improvement.

  The blending amount of (E) talc and / or mica is 1 to 45 parts by weight, preferably 5 to 35 parts by weight, more preferably 10 to 25 parts by weight with respect to 100 parts by weight of the component (B). . By blending 1 part by weight or more of talc and / or mica, an effect of further improving vibration resistance can be obtained, and mechanical strength is also improved. In addition, by blending 45 parts by weight or less, the flowability and thermal conductivity of the resin composition are not impaired, viscosity increase during melt kneading can be suppressed when producing the composition, and good injection moldability Can be maintained. Moreover, it is preferable because the heat dissipation effect of the motor cooling heat dissipation member can be maintained.

  The talc and / or mica of the above (E) may be surface-treated within a range not impairing the effects of the present invention, and examples of the treatment agent for performing the surface treatment include a surface modifier and a sizing agent. Specifically, fatty acids, waxes, nonionic surfactants, epoxy compounds, isocyanate compounds, silane compounds, titanate compounds, phosphorus compounds, aluminum salts such as alumina, silicates such as silicon dioxide And titanium salts such as titanium dioxide.

  Further, the resin composition used in the present invention is a plasticizer such as a polyalkylene oxide oligomer compound, an ester compound, an organic phosphorus compound, an inorganic fine particle, an organic phosphorus compound, and a metal oxide, as long as the effects of the present invention are not impaired. Products, crystal nucleating agents such as polyether ether ketone, polyolefins such as polyethylene and polypropylene, montanic acid waxes, montanic acid and its metal salts, esters thereof, half esters thereof, stearyl alcohol, stearamide, various bisamides, bisureas, polyethylene Wax, metal soaps such as lithium stearate and aluminum stearate, ethylenediamine, stearic acid / sebacic acid polycondensate, mold release agents such as silicone compounds, anti-coloring agents such as hypophosphites, phosphorus antioxidants , Sulfur antioxidants, etc. Anti-oxidation agent, weathering agent and ultraviolet ray prevention agent (resorcinol, salicylate, benzotriazole, benzophenone, hindered amine, etc.), heat stabilizer (hindered phenol, hydroquinone, phosphite, and substituted products thereof) ), Foaming agent, pigment (cadmium sulfide, phthalocyanine, carbon black, metallic pigment, etc.), dye (eg, nigrosine), antistatic agent (alkyl sulfate type anionic antistatic agent, quaternary ammonium salt type cationic antistatic agent, Nonionic antistatic agents such as polyoxyethylene sorbitan monostearate, betaine amphoteric antistatic agents, etc.), flame retardants (eg, red phosphorus, melamine cyanurate, magnesium hydroxide, aluminum hydroxide, etc.) , Ammonium polyphosphate, brominated poly Styrene, can be added brominated polyphenylene ether, brominated polycarbonate, conventional additives such as brominated epoxy resin or their brominated flame retardant and the three combinations of antimony oxide and the like).

  The resin composition constituting the motor cooling heat dissipating member of the present invention is usually produced by a known method. For example, (A) component, (B) component, (C) component and other necessary additives such as (D) component and (E) component are premixed or premixed as necessary. It is prepared by supplying to an extruder etc. without melting and kneading sufficiently. Specific examples include a method of kneading a mixture of raw materials at a temperature of 260 to 400 ° C. using a commonly known melt kneader such as a single or twin screw extruder, a Banbury mixer, a kneader, and a mixing roll. be able to. Further, the mixing order of the raw materials is not particularly limited, and a method in which all raw materials are melt-kneaded by the above method, a method in which some raw materials are melt-kneaded by the above method, and the remaining raw materials are melt-kneaded, or Any method may be used, such as a method in which the remaining raw materials are mixed using a side feeder during melt kneading of a part of raw materials with a single-screw or twin-screw extruder. Preferably, a polyphenylene sulfide resin and an olefin-based resin are melt-kneaded and then magnesium hydroxide, glass fibers having a fiber diameter of 4 to 11 μm, talc and / or mica are added, and melt-kneaded. Among them, after supplying polyphenylene sulfide resin and olefin resin using a twin screw extruder, melt kneading, and after supplying and kneading magnesium hydroxide, 4-11 μm glass fiber, talc and / or mica using a side feeder A method of removing gas generated by exposure to a vacuum state can be preferably mentioned. By obtaining a polyphenylene sulfide resin composition by such an extrusion process, a material in which each component is well dispersed can be obtained. As for the small amount additive component, other components may be kneaded and pelletized by the above-described method and then added before molding and used for molding.

  In the present invention, the motor cooling heat dissipating member is formed by melt-molding the resin composition by an ordinary molding method (injection molding, press molding, injection press molding, etc.). Among these, from the viewpoint of mass productivity, it is preferable to form by injection molding or injection press molding.

  The resin composition of the present invention not only has excellent moldability, but also has the unknown attributes of being excellent in vibration resistance, high-speed stress resistance, thermal conductivity, and light weight. It is suitable for members that require heat dissipation against heat generation, members that contact the metal that dissipates the generated heat, components, peripheral components, and housings. In particular, it can be used as a heat radiating member for motor cooling of a hybrid vehicle in which a drive mechanism that has been developed in recent years uses a gasoline and a motor together, a fuel cell vehicle in which the drive mechanism is a motor only, or an electric vehicle. Furthermore, for motor stator members that perform the rotor permanent magnet magnetization process with the stator built-in, which requires high-speed stress resistance, and for in-wheel motor-type motor cooling heat dissipation members that require reliability against vibration. It can be used suitably.

  Specifically, the motor cooling heat-dissipating member is used for motor cooling methods such as air cooling, water cooling circulation, and oil circulation, and includes a housing around the motor stator and a cooling water circulation path inside the motor stator housing. And / or heat radiating member of cooling oil circulation path, heat radiating pipe, pipe holding fixture, cap, heat radiating from motor heat generating part to air and / or cooling water, cooling oil via metal, ceramics and other cooling members Cooling parts that require various heat dissipation properties such as fins are included. These motor cooling heat dissipating members can also be used as a motor cooling heat dissipating member as a composite of a molded body made of the resin composition of the present invention and metal or ceramics.

  Hereinafter, although an example is given and the present invention is explained in detail, the gist of the present invention is not limited only to the following examples.

Reference Example 1 Preparation of Polyphenylene Sulfide Resin PPS In a 20 liter autoclave equipped with a stirrer and a valve at the bottom, 2383 g (20.0 mol) of 47% sodium hydrosulfide (Sankyo Kasei) and 831 g of 96% sodium hydroxide (19. 9 mol), 3960 g (40.0 mol) of N-methyl-2-pyrrolidone (NMP), and 3000 g of ion-exchanged water, and gradually heated to 225 ° C. over about 3 hours while passing nitrogen at normal pressure. After distilling 4200 g and NMP 80 g, the reaction vessel was cooled to 160 ° C. The residual water content in the system per mole of the alkali metal sulfide charged was 0.17 mole. The amount of hydrogen sulfide scattered per mole of the alkali metal sulfide charged was 0.021 mol.

  Next, 2942 g (20.0 mol) of p-dichlorobenzene (Sigma Aldrich) and 1515 g (15.3 mol) of NMP were added, and the reaction vessel was sealed under nitrogen gas. Then, while stirring at 400 rpm, the temperature was increased from 200 ° C. to 227 ° C. at a rate of 0.8 ° C./min, then increased to 274 ° C. at a rate of 0.6 ° C./min, and held at 274 ° C. for 50 minutes. Then, the temperature was raised to 282 ° C. Open the extraction valve at the bottom of the autoclave, pressurize with nitrogen, flush the contents to a vessel with a stirrer over 15 minutes, stir at 250 ° C for a while to remove most of the NMP, polyarylene sulfide (PPS) And solids containing salts were recovered.

  The obtained solid and 15120 g of ion-exchanged water were placed in an autoclave equipped with a stirrer, washed at 70 ° C. for 30 minutes, and suction filtered through a glass filter. Next, 17280 g of ion-exchanged water heated to 70 ° C. was poured into a glass filter, and suction filtered to obtain a cake.

  The obtained cake and 11880 g of ion-exchanged water were charged into an autoclave equipped with a stirrer, and the inside of the autoclave was replaced with nitrogen, and then the temperature was raised to 192 ° C. and held for 30 minutes. Thereafter, the autoclave was cooled and the contents were taken out.

  The contents were subjected to suction filtration with a glass filter, and then 17280 g of ion-exchanged water at 70 ° C. was poured into the contents, followed by suction filtration to obtain a cake. The obtained cake was dried with hot air at 80 ° C., and further dried under vacuum at 120 ° C. for 24 hours to obtain dry PPS. The obtained PPS had a weight average molecular weight in terms of polystyrene of 20000.

  The weight average molecular weight was measured by the following method.

  Polymer 5 mg, 1-chloronaphthalene 5 g was weighed into a sample bottle, placed in a high-temperature filter set at 210 ° C. (SSC-9300 manufactured by Senshu Kagaku), heated for 5 minutes (1 minute preheating, 4 minutes stirring), The sample was prepared by taking it out from the high-temperature filter and leaving it to room temperature. Subsequently, the weight average molecular weight was measured under the following measurement conditions.

GPC measurement condition device: Senshu Science SSC-7100
Column name: Senshu Science GPC3506 × 1
Eluent: 1-chloronaphthalene (1-CN)
Detector: Differential refractive index detector Detector sensitivity: Range 8
Detector polarity: +
Column temperature: 210 ° C
Pre-temperature bath temperature: 250 ° C
Pump bath temperature: 50 ° C
Detector temperature: 210 ° C
Sample-side flow rate: 1.0 mL / min
Reference side flow rate: 1.0 mL / min
Sample injection amount: 300 μL
Calibration curve preparation sample: polystyrene.

Reference Example 2 Magnesium hydroxide B1: “KISUMA5EU” manufactured by Kyowa Chemical Industry Co., Ltd.

Reference Example 3 Glass fiber C1: Chopped strand “T-747H” manufactured by Nippon Electric Glass Co., Ltd. Fiber diameter 10.5 μm
C2: Nippon Electric Glass Co., Ltd. chopped strand “T-790DE” fiber diameter 6 μm
C3: Nippon Electric Glass Co., Ltd. chopped strand “T-717”, fiber diameter 13 μm
The fiber diameter was measured according to JIS “R-3420” (established on April 1, 1978, date of latest revision, September 1, 2006).

Reference Example 4 Olefin Resin D1: “BF-E” manufactured by Sumitomo Chemical Co., Ltd., ethylene / glycidyl methacrylate = 88/12 wt% copolymer D2: “Tuffmer A4085” manufactured by Mitsui Chemicals, ethylene / butene-1 = 82 / 18 wt% copolymer.

Reference Example 5 Talc E1: Talc “NK-64” manufactured by Fuji Talc, average particle size 19 μm
E2: Talc “NK-48” manufactured by Fuji Talc Co., Ltd., average particle diameter of 26 μm.

Reference Example 6 Mica E3: Industrial wet pulverized mica powder “A-21” manufactured by Yamaguchi Mica Co., Ltd., average particle size 22 μm
E4: Industrial wet pulverized mica powder “A-41” manufactured by Yamaguchi Mica Co., Ltd., average particle size 47 μm.

Reference Example 7 Alumina F1: “AL-43KT” manufactured by Showa Denko KK, average particle size 4.6 μm.

Reference Example 8 Graphite F2: “KS-75” manufactured by Timcal Japan, average particle diameter of 75 μm.

Examples 1-13
The polyphenylene sulfide resin of Reference Example 1 and the olefin resin of Reference Example 4 shown in Table 1 are preloaded using a twin screw extruder with a screw diameter of 44 mm (TEX-44, manufactured by Nippon Steel). The magnesium hydroxide of Reference Example 2, the glass fiber of Reference Example 3, the talc of Reference Example 5, and the mica of Reference Example 6 were introduced from the intermediate addition port, and the resin temperature was 300 ° C. and the screw rotation speed was 200 rpm. Melt kneading was performed to obtain pellets. Subsequently, after drying for 5 hours with a 130 degreeC hot-air dryer, evaluation mentioned later was performed. The results are shown in Table 1.

Comparative Examples 1-6
Using a twin screw extruder with a screw diameter of 44 mm (TEX-44, manufactured by Nippon Steel Works), the polyphenylene sulfide resin of Reference Example 1 and the olefin resin of Reference Example 4 shown in Table 2 are preloaded. The magnesium hydroxide of Reference Example 2, the glass fiber of Reference Example 3, and the graphite of Alumina Reference Example 8 of Reference Example 7 are charged from the intermediate addition port and melted at a resin temperature of 300 ° C. and a screw rotation of 200 rpm. Kneading was performed to obtain pellets. Subsequently, after drying for 5 hours with a 130 degreeC hot-air dryer, evaluation mentioned later was performed. The results are shown in Table 2.

(1) Vibration resistance JIS K2113 test piece shape described in JIS K7113 using an injection molding machine promat (25t) (manufactured by Sumitomo Heavy Industries, Ltd.) at a cylinder temperature of 320 ° C. and a mold temperature of 150 ° C. 20 molded products having a thickness of 2 mm) were molded at a molding lower limit pressure of +5 MPa so that the resin composition injected from both ends in the longitudinal direction of the molded product to the center of the test piece was abutted.

  Next, the obtained molded product was arranged in a stainless steel container at the bottom of the container so as to be parallel to the width direction of the molded product. The stainless steel container containing the molded product was placed in an ultrasonic cleaner US-10PS (manufactured by NSD: oscillator, 38 kHz BLT self-oscillation) containing water and operated for 5 minutes, and 10 of the obtained molded products were used. A vibration treatment was performed. About 10 molded products not subjected to vibration treatment (molded product before vibration treatment) and 10 molded products after vibration treatment (molded product after vibration treatment) are installed on a support table for bending test with a fulcrum distance of 30 mm. The maximum value (Kgf) when the molded product breaks by pressing DIGITAL FORE GAUGE “MODEL PDG-50 (manufactured by MARUBISHI)) against the molded product abutting part (center part of the test piece) is measured, and the average of 10 each The values were the strength before vibration treatment and the strength after vibration treatment.

  When the molded product abutting portion was broken after the vibration treatment, the number of fractured molded products was specified as “number of fractured molded products after vibration treatment”. In the measurement of vibration resistance, the molded product fractured by the vibration treatment was used for calculating the average value as a numerical value of 0 Kgf.

The vibration resistance was calculated by the following formula (1).
Vibration resistance = (breaking strength after vibration treatment) / (breaking strength before vibration treatment) x 100 (1)
The closer the numerical value of vibration resistance of the above formula is to 100, the better the vibration resistance.

(2) High-speed stress resistance Bending test piece (127 mm) used for ASTM D790 bending test using injection molding machine UH1000 (80t) (manufactured by Nissei Plastic Industry Co., Ltd.) under the temperature conditions of cylinder temperature 320 ° C and mold temperature 150 ° C. 50 × 13 mm × 3.1 mm thickness) were produced. This molded product is mounted with a bending test jig for ASTM D790 using a universal material testing machine RTA-1T (Orientec Co., Ltd.), with a load cell rating of 200 kgf, a range of 40%, a distance between branches of 100 mm, and a crosshead speed of 100 mm / min. When a load is applied from the load measurement point to a displacement of 2.0 mm, the crosshead is stopped and returned to the measurement start position. This is repeated twice for one test piece, and 50 of each are measured. The smaller the number of bent specimens is, the better the high-speed stress resistance is.

(3) Thermal conductivity Using an injection molding machine UH1000 (80t) (manufactured by Nissei Plastic Industry Co., Ltd.), a corner-shaped product (50 mm x 50 mm x 3 mm thickness, film) under the temperature conditions of a cylinder temperature of 320 ° C and a mold temperature of 150 ° C Gate) and both surfaces of this molded product were cut to a depth of 0.5 mm to obtain a test piece having a thickness of 2 mm, and a heat flow meter method thermal conductivity measuring device “GH-1S” (manufactured by Rigaku Corporation). ) To measure the thermal conductivity. The higher this value, the better the thermal conductivity.

(4) Lightweight Using an injection molding machine UH1000 (80t) (manufactured by Nissei Plastic Industry Co., Ltd.), a corner forming product (50 mm x 50 mm x 3 mm thickness, film gate) under the temperature conditions of a cylinder temperature of 320 ° C and a mold temperature of 150 ° C ) And the density of this molded product was measured using a solid density measuring device. Since the specific gravity of aluminum is 2.7 and the specific gravity of cordierite, which is light among ceramics, is 2.6, the light weight is excellent when the specific gravity is 2.0 or less.

  As is clear from the results in Tables 1 and 2, the heat-radiating member for motor cooling made of the resin composition of the present invention achieves excellent vibration resistance, high-speed stress resistance, and thermal conductivity, Because it is lighter than ceramics, etc., it has excellent heat dissipation with respect to an increase in the amount of heat generated with an increase in motor output, and it can be applied to motor-driven vehicles such as hybrid vehicles, fuel cell vehicles, and electric vehicles. This is a motor cooling heat dissipating member that can be applied to an in-wheel motor type motor that is capable of being excellent in high-speed stress resistance at the time of magnetizing the rotor and that requires further vibration.

Claims (6)

(A) 25 to 45% by weight of polyphenylene sulfide resin, (B) 10 to 60% by weight of magnesium hydroxide, and (C) fiber diameter is 4 to 100% by total of (A), (B) and (C) A heat-dissipating member for cooling a motor formed by blending 15 to 65% by weight of 11 μm glass fiber and molding a resin composition having a thermal conductivity of 0.8 W / m · K or more measured by a heat flow meter method. The fiber diameter of the said glass fiber is 5-8 micrometers, The heat radiating member for motor cooling of Claim 1 characterized by the above-mentioned. The resin composition is a resin composition obtained by further blending 1 to 10 parts by weight of (D) an olefin resin with respect to 100 parts by weight of the total of (A), (B), and (C). Item 3. A heat-radiating member for cooling a motor according to any one of Items 1 and 2. The motor cooling according to any one of 1 to 3, wherein the resin composition is a resin composition obtained by further blending 1 to 45 parts by weight of (E) talc and / or mica with respect to 100 parts by weight of (B). Heat dissipation member. The motor cooling heat dissipating member according to any one of 1 to 4 used for a motor stator peripheral member. The motor cooling heat dissipating member according to any one of 1 to 5 mounted on an in-wheel motor.